2157683857920 has 240 divisors, whose sum is σ = 7749433692000. Its totient is φ = 575382196224.

The previous prime is 2157683857913. The next prime is 2157683857957. The reversal of 2157683857920 is 297583867512.

2157683857920 is a `hidden beast` number, since 2 + 1 + 5 + 7 + 6 + 8 + 38 + 579 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1112170 + ... + 2356329.

It is an arithmetic number, because the mean of its divisors is an integer number (32289307050).

Almost surely, 2^{2157683857920} is an apocalyptic number.

2157683857920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157683857920 is an abundant number, since it is smaller than the sum of its proper divisors (5591749834080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2157683857920 is an frugal number, since it uses more digits than its factorization.

2157683857920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3468537 (or 3468509 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 2157683857920 in words is "two trillion, one hundred fifty-seven billion, six hundred eighty-three million, eight hundred fifty-seven thousand, nine hundred twenty".